For example, OPTI has a built-in Optiflow Sensor (a downward facing sensor), which functions by picking out the patterns on the ground to ensure that the drone maintains a straight position. ATTI, conversely, works a bit differently. With the ATTI, the drone employs other techniques apart from the external sensors to keep the drone in the right orientation and altitude. Thus, the drone can hover in place, or drift slightly around with the wind serving as a push. You will also find a GPS in some drones, and they help the drone to maintain coordinated and precise flights and landings.
The first retail multi-rotor drones were little more than flying toys with limited range and battery power. Their small motors were charged via battery pack, and a basic RF controller moved their rotors to achieve loops, dives, and hovers. But technology has grown in recent years, and today, many people use these types of drones to perform aerobatic stunts and aerial races.
One of the cheaper options for an autopilot drone is the Hubsan H501S. It doesn’t have as many camera features as some of the more professional drones, but it is still equipped with some great auto features. It comes with a 1080p HD camera and has automatic return, altitude mode, and follow-me capabilities. It’s small, compact size makes it good for traveling and you get an average of 20 minutes of flying which is great for the price you’re paying. While more professional drone features are missing, you’re still getting a nice drone for less than $300.
Many manufacturers mount cameras inside the body of the drone. This is acceptable for casual photography, but if you want more professional results, consider adding an external camera mount, or gimbal. Gimbals allow you to place your video or still camera in front of the drone body, away from the vibrating motor and rotors. Gimbals can swivel and pivot, providing you with additional control over your imagery.